I think you would do well with the copper lenses for all-around fishing...esp if photochromatic. I really liked my medium brown lenses, but bought some copper glass lenses last year and they are great.

True amber lenses are really specialized for low light. So if you're going to spend your day staring at a sand flat in intense sunshine you probably want something with a little more brown in it - or maybe a moderate grey color.

I spent a lot of time shopping around for a pair last year and found that having a good wrap style frame to keep the light out and optic-quality glass lenses greatly helped - both on the flats and the trout stream.